Performance analysis of multiple microjet impingement cooler

Abstract

A kind of multiple microjet impingement cooler with return channels was designed. Thermal performances of the cooler have been studied by experimental and numerical methods. Under steady-state conditions the distribution of temperature, velocity and pressure were obtained at different running parameters and structure parameters of the cooler, respectively. The results show that impingement distance has a great effect on the thermal performance of the cooler. Average Nusselt number increases with the impingement distance increasing. Average temperature of the target surface decreases with the impingement distance decreasing and have a more uniformed temperature distribution on the target surface. Temperature of target surface decreases with decreasing of air volume flow rate. Pressure drop increases with Reynolds number increasing, and it will rapid increases when Reynolds number is higher than 5000. Average heat transfer performance is inversely proportional to air volume flow rate, it will be improved when air volume flow rate increases.